Nuclear power can generate electricity without greenhouse gas emissions. However, there are concerns about its safety. Learn about the safety and health concerns associated with the threat of nuclear meltdowns, as well as the challenges involved in storing radioactive waste.he isotope U-235 is important because it can be used in the nuclear fission chain reaction to create a lot of energy. Unlike the uranium used in a nuclear bomb, which is about 90% enriched with the isotope U-235, the uranium used in a nuclear reactor is only slightly enriched, to about four or five percent.
1 Professional sod installation typically costs $500 to $1,000 for a 2,000 sq. ft. or smaller lawn. 2  Per square foot installation costs average $.50 to $1.00. 3  Installing sod on smaller lawns tends to cost more per square foot.
1 Having sod professionally installed just about doubles the cost to 14-60 cents a square foot, or $280-$1,000 for 2,000 square feet. 2  A contractor may use special equipment to install rolls of sod 42 inches wide and up to 128 feet long, which saves on labor costs, creates fewer seams and gets the job done more quickly. Usually the cost per square foot is lower for a large, flat area that can be installed mechanically, averaging 15-24 cents or $6,500-$10,500 an acre (43,560 square feet).